Siswanto, Moh. Rifandhi Suling, and Siti Nur Kayatun. “Implementation Of the Six Sigma Method To Improve The Quality Of Packaged Drinking Water”. Metode : Jurnal Teknik Industri 11, no. 1 (March 31, 2025): 77–87. Accessed May 2, 2025. http://www.ejournal.um-sorong.ac.id/index.php/metode/article/view/3987.